fuel avarage

D

DodgeRam

New member
I now have 114 hrs on my twins 50s . It seem that it is getting a little better on fuel . I keep only about 15 gallons of fuel, don't see the need of packing all that extra weight like I use to do when I first got my boat. Is it okay to leave the tanks 3/4 or so empty? I do have a water separator filter, and my boat will be use all year around . The numbers on my last trip, with me, my dog (chocolate lab name TIA 75 Pds ) 195 prawns!!!!!! I was doing 18 to 19 on the GPS burning 4.5 to 4.8 at 4000 rpm . Is that an average for this 22' boat, the boat felt very good at that speed. Gary SEARAM
 
I didn't reply earlier because I run twin 40's, but looking at your numbers make me wish I'd gone with the 50's that was my first inclination. But NOOOO, I decided to save $1200--- dang! :roll:
 
I didn't reply because I was jealous of the prawns.

That, and all I could add to the discussion was some old history of a CD22 with a single 75. Measured the old fashioned way, using GPS miles, the amount of gas poured into the tank, and arithmetic, it averaged 5 smpg all the time every time when time to fill the tank.
 
It's OK to leave the tanks 3/4 empty as long as you regularly run fresh fuel through them. If you're gonna let the fule sit for any length of time, it's better to have near full tanks with Stabil (or similar) added. However, I almost always have the tanks over 50% since I never know where I might want to go on any given day and don't EVER want to run empty. Also, the loss of fuel economy by running with near full tanks filled from a station on land is minor relative to the expense of purchasing fuel on the water.

Roger
 
We have twin 40's, so not directly applicable. We are heavy (C-Dory 22 cruiser) since we are living aboard for extended cruises. Over 20,000 miles and 2,300 hours we have averaged 4.2 nautical miles per gallon. Now these miles were under all conditions, from idle to WOT, from 0 elevation to 6,000 feet, from glass surface to a high sea, with the current, against the flow salt water and fresh ... don't know if this helps, but that's our result with twin 40's on a CDory 22.
 
Our gallons per hour over the lifetime of Halcyon is 2.11 g/h so it appears that our average speed has been somewhat less than 10 knots, eh? OK, we've never pretended to be speed demons.
 
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